56. I found _______impossible for _______to work out the maths problem.
___________, he would have been fired.
________ be sent to work in Beijing?
Is it John that is being scolded in the manager’s office?No. It ______ be him. I saw him on the way just now.
Every means has been _______. No one is effective.
The forest guard often find campfires that had not been _______ completely.